Journal
FOOD CONTROL
Volume 66, Issue -, Pages 8-16Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2016.01.035
Keywords
Biofilms; Plasma; Clove oil; Synergetic antibacterial effect; Escherichia coli O157:H7
Categories
Funding
- National Natural Science Foundation of China [31301573]
- Natural Science Foundation of Jiangsu Province [BK20130493]
- Jiangsu University research foundation [11JDG050]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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This study aims to evaluate the antimicrobial effects of cold nitrogen plasma (CNP) and clove oil against Escherichia coli O157:H7 (E. coli O157:H7) biofilm on lettuce. Both clove oil (1 mg/mL, 2 mg/mL and 4 mg/mL) and CNP (400-600 W) displayed significant eradication effect on E. coli O157:H7 biofilms in vitro (p < 0.001). Subsequently, the antibiofilm effect of combined treatment was studied as well. Compared with the respective treatment, combined treatment exhibited remarkable synergistic effect on eradicating E. coli O157:H7 biofilms. The confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) had also visually testified that the antibacterial effects of clove oil on E. coli O157:H7 biofilms (in vitro and on lettuce) were enhanced by CNP at 400 W for short treatment duration. The results of sensory evaluation indicated that combined treatment has mild negative effect on lettuce quality. Moreover, the synergetic antibacterial mechanism of clove oil and CNP against E. coli O157:H7 was concluded as that they could damage the bacterial cell wall and the outer membrane, leading to leakage of cellular components, such as nucleic acid and ATP. (C) 2016 Elsevier Ltd. All rights reserved.
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